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Description
Holley Terminator X MAX Engine Management Systems 550-926TERMINATOR X MAX MPFI W TRANS & DBW, LS1 Take control of your LS engine with Terminator X Max! Don't settle for a junkyard ECU with a cumbersome tuning interface when you can have complete control of your engine, self learning fuel strategies and the proven, race winning technology of Holley EFI at a budget friendly price! Terminator X Max features real time fuel learn, high impedance injector drivers, an integrated 1bar MAP sensor, and 4 programmable
TERMINATOR X MAX MPFI W/TRANS & DBW, LS1
Take control of your LS engine with Terminator X Max! Don't settle for a junkyard ECU with a cumbersome tuning interface when you can have complete control of your engine, self-learning fuel strategies and the proven, race-winning technology of Holley EFI at a budget-friendly price! Terminator X Max features real-time fuel learn, high impedance injector drivers, an integrated 1bar MAP sensor, and 4 programmable inputs and outputs. The inputs and outputs are ideal for electric fans, boost control solenoids, progressive nitrous control, and much more. Part number 550-926 also has 4L60E or 4L80E Transmission control and Drive-By Wire Throttle Body control. Terminator X Max comes fully loaded with base maps for common LS engine combinations to get you out of the garage and on the road/track fast. The 3.5" touch screen LCD handheld contains an easy to use calibration wizard as well as tuning and gauge display functions. Also included is Holley EFI's industry-leading, easy to use software suite that allows full laptop access for advanced users. Whether you are building a budget beater or a boosted race car, Terminator X MAX has the features and technology you need at a price that won't break the bank!
Features:
- For GM LS1/LS6 engines with 24x crank reluctor with EV1 injectors and 4L60E/4L80E transmissions, and drive-by wire throttle body control.
- Real-Time fuel map learn, takes the guess work out of tuning your base fuel table.
- High Impedance Injector Drivers will safely power most Stock LS injectors, and Holley EFI Injectors. Injector support chart provided in the instructions (Will not control Low Impedance Injectors)
- All of the new Terminator X Max systems utilize the Bosch LSU 4.9 wideband to relay AFR information to the ECU for accurate reading and precise tuning control.
- On-Board 1bar MAP sensor, is perfect for N/A or Nitrous engine combos. If your combination requires a 2+Bar, we recommend GM 12592525, and our adapter part number 558-416.
- MAP Sensor vacuum hose adapters (1/8th – ¼ and 3/16ths)
- 4 Inputs – 12v, Ground, 5v, and Frequency, for things such as additional pressure sensors, or activation triggers for nitrous activation, or a trans brake
- 4 Outputs – Ground, PWM - , for accessories such as; fans, boost control, nitrous control, IAC Kit, and More
- Boost Control – Boost vs Time, Boost vs Gear, Boost vs RPM, Boost vs Speed, Boost Safeties
- Nitrous Control – Single Channel of Wet or Dry, Progressive or Non-Progressive, Rich/Lean Safeties, and target Closed Loop AFR
- Advanced Tables – 4x 1D Tables, 1x 1D per Gear Table, 4x 2D Tables, 1x 2D per Gear Table, can be used for any custom tables you can dream up, such as Flex Fuel Sensor Offset Table, or a custom fuel or oil pressure safety!
- On-Board Diagnostic LEDS for: ECU Power – Engine Run – Wideband Status – TPS Calibration – Crank Signal –Cam Signal. Allow you to identify any Critical engine issues at a glance
- The included 3.5" Touchscreen Handheld contains a calibration wizard, that allows you to quickly build a base tune for any LS engine. Additionally the handheld provides internal data-logging and a fully customizable gauge display.
- The compact ECU size allows you to mount it virtually anywhere. Remember, diagnostic LEDS must face up!
- Plug and play compatible with more Holley EFI accessories such as; analog style gauges, shift lights, various modules, and coming soon, 12.3" digital dash support!
- Free EFI Tuning Software for complete control of your Terminator X power plant
- Recommended Pedal part number - 10379038
- Includes: 24x LS Engine Main Harness - EV1 Injector Harness - DBW Throttle Body Harness - 4L60E/4L80E Transmission Control Harness - Terminator X MAX ECU - ECU Main Power Harness - Bosch LSU 4.9 Wideband Oxygen Sensor - Input/Output Harness - and assorted
Specs
| Brand | Holley EFI |
|---|---|
| Crank Reluctor | 24x |
| Emission Code | 3 |
| Ignition Type | GM LS 24x |
| Injector Connector | Jetronic / Minitimer (Bosch) |
| Product Type | Terminator X Max LS MPFI |
| Terminator LS Options | Fuel, Spark, Drive-by-Wire, Transmission |
| Part Number | 550-926 |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 8 reviews
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Product Reviews
★★★★★ 5
Recommend
Worx better than expected. Much improved the appearance and texture after washing & drying my 6 sheepskin pelts and three faux sheepskin pelts. There’s always a natural shedding after a cleaning, but this DEFINITELY decreases those incidents
I recommend.
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Reviewed in the United States on April 16, 2026
★★★★★ 5
POLYESTER?!?!
Color: Ivory, Size: 2' x 3' (Pelt), Color: Ivory, Size: 2' x 3' (Pelt)
POLYESTER?!?!
So i just bought several of these. Nice and big and fluffy, looked very clean, very nice. Cats instantly were scared/curious. The back of the skin, the wool, all looked nice, and then I noticed it had a tag on it... The tag says... 100% POLYESTER! What?!?!? This is supposed to be New Zealand Sheep Skin pelt! Shouldnt be any Polyester at all. So, just before I was about to return it, i did a small burn test. I cut off a small bunch of hair and burned it. The fire tried to light but it quickly extinguished itself. And the smell... yes... the smell told me it is REAL WOOL and the fact the fire went out right away also confirms this is not oil based. THIS IS REAL, This is NOT Polyester. I guess also a lot of ppl are returning because of the tag, so these are at a HUGE DISCOUNT!!! BUY THEM UP!!!
They also came in vacuum packed bags, looked nice and kept very nice. These are excellent!
See my photos, the tag, the burned bunch of hair... fire went out, i tried it three times, fire kept instantly going out... smells organic like animal hair when burned, not like oil/polyester. ENJOY!!! I PAID FOR THESE, I was not given anything here!
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Reviewed in the United States on September 1, 2025
★★★★★ 5
Love this product!
Color: Linen, Size: 2' x 3' (Pelt)
This sheepskin elevated a boring leather couch to a luxurious sitting space! I purchased 2, one for each loveseat, as sometimes the leather is a little cold. The sheepskin with a small lumbar pillow and voila! A cozy place everyone gravitates to! The sheepskin is soft and cozy and everyone comments they want one! ha probably will get this as a couple of gifts (for those guests that said they wanted one too)
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Reviewed in the United States on May 15, 2026
★★★★★ 5
Perfect sheepskin rug
Color: Ivory, Size: 2'3" x 3'5" (Large Pelt)
This sheepskin rug is fabulous! I have it over my office chair and I LOVE it. It does not shed, it stays in place and fits over the seat and up the entire back of the chair with a bit remaining to hang over the edge. My cat sleeps on it every chance he gets. Great value for the price! Just looking at it brings me joy, such a beautiful sheepskin.
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Reviewed in the United States on May 6, 2026
★★★★★ 5
Dog ignores, but I like
Color: Ivory, Size: 2' x 3' (Pelt), Color: Ivory, Size: 2' x 3' (Pelt)
I bought this for my dog, who is old and has creaky joints. My dog prefers to continue resting in uncomfortable places that put my plants in peril. He does not ever recline on this dead sheep and looks at me as though I am the sheep slaughterer.
Spouse asked if it came in bigger sizes. Since this is the skin of a dead sheep, it depends on live sheep girth. Anything bigger would likely have to be sewn together from multiple dead sheep.
I find the girth of this sheep pelt perfectly acceptable. It is nice and thick and soft and fairly easy to vacuum. I frequently recline on it when stretched out on the floor, and am grateful it does not leave a mess or make noise like my dog, who should be grateful that his pelt is still attached to his body.
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Reviewed in the United States on January 4, 2024